I am pretty sure the buyers of the D&D books don't buy the SRD only. They're buying layout, non-SRD content, and maybe even art, or the comfort of having a printed item instead of an online document or (who knows) they actively want to support Hasbro for owning WotC and marginally the authors. If there are people who actually are buying the otherwise free SRD... it's sad, and probably they don't know about the SRD being otherwise available.
Amazingly, you're both missing the point and getting it at the same time. You don't need the non-SRD content because there's so much free homebrew. Who cares if you don't have access to beholders when there's probably
thousands of other monsters you can use. Who cares if you can't cast
Nystul's magic aura when
magic aura is freely available to you, along with hundreds or thousands of other spells people have created. You don't need the non-SRD archetypes when r/UnearthedArcana has dozens for you. And a lot of the art is already posted online by WotC as previews.
But the point is not why people buy the books but that they do. The fact, no matter how much free stuff there is that is freely available, people still buy the books. No matter how much AI is put out there for free, people will still pay money for it, and lots of it.
And what will happen should a major company like WotC decide that they're going to write or illustrate with AI? Do you
really think they're going to put out their books for free or at cost?
Why? Do you think it would be better if I considered myself important enough to try and impose my personal ethical views on others?
When those views are "don't steal," yes. I mean, that's a big one. We're not talking about saying "I think it's immoral to like the wrong sex or pierce your ears or vote for that person or eat that cheeseburger." We're talking about not taking things that don't belong to you and then claiming it's yours. This is
preschool stuff, dude.
Here: do me a favor and read this article:
https://authorsguild.org/news/ai-driving-new-surge-of-sham-books-on-amazon/
(Yes, I have heard a person say it was immoral to pierce your ears)